To the best of my understanding, they will put all your meal credits on your KTTW cards (which is also where you "keep" your tickets). This way all you need to do is keep your room keys on you, and these take care of everything else. You recieve all your meal credits upon check-in, so if you want to do a 2 TS-credit meal on the first day that is perfectly fine (just as an example). Also, all of the credits can be accessed from anyone in your room's card, so if you split up into groups you can still use these credits.